Vela Incident

The Vela Incident, also known as the South Atlantic Flash, was an unidentified "double flash" of light detected by an American Vela Hotel satellite on September 22, 1979, near the Prince Edward Islands off Antarctica, which many believe was of nuclear origin. The most widespread theory among those who believe the flash was of nuclear origin is that it resulted from a joint South African and Israeli nuclear test.[1][2][3] The topic remains highly disputed.

While a "double flash" signal is characteristic of a nuclear weapons test, the signal could also have been a spurious electronic signal generated by an aging detector in an old satellite, or a meteoroid hitting the Vela satellite. No corroboration of an explosion, such as the presence of nuclear byproducts in the air, was ever publicly acknowledged, even though there were numerous passes in the area by U.S. Air Force planes specifically designed to detect airborne radioactive dust. Other examiners of the data, including the Defense Intelligence Agency (DIA), the U.S. Naval Research Laboratory (NRL), and defense contractors, have come to the conclusion that the flash was not a result of a nuclear detonation.[4][5][6] Much information about the event remains classified.

Vela-5A/B Satellites in a clean room. The two satellites are separated after launch.

The "double flash" was detected on September 22, 1979, at 00:53 GMT, by the American Vela satellite 6911, which carried various sensors designed specifically to detect nuclear explosions that contravened the Partial Nuclear Test Ban Treaty. In addition to being able to detect gamma rays, X-rays, and neutrons, the satellite also contained two silicon solid-state bhangmeter sensors that could detect the dual light flashes associated with an atmospheric nuclear explosion: the initial brief, intense flash, followed by a second, longer flash.[6]

There was, and remains, much doubt[8][page needed] as to whether the satellite's observations were accurate. The Vela Hotel 6911 satellite was one of a pair that had been launched on May 23, 1969, over ten years before the "double-flash" event, and this satellite was already more than two years beyond its so-called "design lifetime". This satellite was known to have a failed electromagnetic pulse (EMP) sensor, and it had developed a fault (in July 1972) in its recording memory, but that fault had cleared itself by March 1978.

Additionally, early technical speculation also examined the possibility that the Vela had recorded a combination of natural phenomena, such as lightning in conjunction with a meteor strike. Other early media reports of the time discussed the possibility of a near-Earth object (NEO) superbolide, such as by an asteroid, occurring.[9] The Vela satellite's flash detectors were sensitive to lightning superbolts,[10][page needed] which resulted in two scientists, John Warren and Robert Freyman from the Los Alamos National Laboratory (then called the Los Alamos Scientific Laboratory), immediately flying to and investigating a rare, overland superbolt occurrence on Bell Island, Newfoundland, in April 1978.[11] Their observations of the event, called the 'Bell Island Boom', noted building structural damage, dead farm animals and destroyed electrical devices amongst other evidence (the superbolt's blast was heard 55 kilometers away in Cape Broyle, Newfoundland).[12][a] The Bell Island Boom was among some 600 "mystery booms" that occurred along the North American eastern seaboard from late 1977 to mid‑1978.[12]

Several U.S. Air ForceWC-135B surveillance aircraft flew 25 sorties over that area of the Indian Ocean soon after the "double flash" was reported, but they failed to detect any sign of nuclear radiation.[17][not in citation given] Studies of wind patterns confirmed that fall-out from an explosion in the southern Indian Ocean could have been carried from there to southwestern Australia.[18] It was reported that low levels of iodine-131 (a short-half-life product of nuclear fission) were detected in sheep in the southeastern Australian States of Victoria and Tasmania soon after the event. Sheep in New Zealand showed no such trace.[18][19]

An independent panel of scientific and engineering experts was commissioned by Frank Press, who was the Science Advisor to president Carter and the chairman of the OSTP, to evaluate the evidence and determine the likelihood that the event was a nuclear detonation. The chairman of this science panel itself was Dr. Jack Ruina of the Massachusetts Institute of Technology, and also the former director of the U.S. Department of Defense's Advanced Research Projects Agency. Reporting in the summer of 1980, the panel noted that there were some key differences in the detected optical signature from that of an actual nuclear explosion, particularly in the ratio of intensities measured by the two detectors on the satellite. The now-declassified report[5] contains details of the measurements made by the Vela Hotel satellite.

The explosion was picked up by a pair of sensors on only one of the several Vela satellites; other similar satellites were looking at different parts of the earth, or weather conditions precluded them seeing the same event.[22] The Vela satellites had previously detected 41 atmospheric tests—by countries such as France and the People's Republic of China—each of which was subsequently confirmed by other means, including testing for radioactive fallout. The absence of any such corroboration of a nuclear origin for the Vela Incident also suggested that the "double flash" signal was a spurious 'zoo' signal of unknown origin, possibly caused by the impact of a micrometeoroid. Such 'zoo' signals which mimicked nuclear explosions had been received several times earlier.[23]

Their report noted that the flash data contained "many of the features of signals from previously observed nuclear explosions",[24] but that "careful examination reveals a significant deviation in the light signature of the September 22 event that throws doubt on the interpretation as a nuclear event". The best analysis that they could offer of the data suggested that, if the sensors were properly calibrated, any source of the "light flashes" were spurious "zoo events". Thus their final determination was that while they could not rule out that this signal was of nuclear origin, "based on our experience in related scientific assessments, it is our collective judgment that the September 22 signal was probably not from a nuclear explosion".[25]

Victor Gilinsky (former member of the Nuclear Regulatory Commission) attempted to cast doubt on the science panel's findings, arguing that its members were politically motivated.[20] There was some data that seemed to confirm that a nuclear explosion was the source for the "double flash" signal. There was the "anomalous" traveling ionospheric disturbance that was measured at the Arecibo Observatory in Puerto Rico at the same time,[20] but many thousands of miles away in a different hemisphere of the earth. A test in Western Australia conducted a few months later found some increased nuclear radiation levels.[26][page needed] However, a detailed study done by New Zealand's National Radiation Laboratory found no such evidence of excess radioactivity, and neither did a U.S. Government-funded nuclear laboratory.[27]Los Alamos National Laboratory scientists who worked on the Vela Hotel program have professed their conviction that the Vela Hotel satellite's detectors worked properly.[20][28]

Leonard Weiss, at the time Staff Director of the Senate Subcommittee on Energy and Nuclear Proliferation, has also raised concerns about the findings of the Ad-Hoc Panel, arguing that it was set up by the Carter administration to counter embarrassing and growing opinion that it was an Israeli nuclear test.[29] Specific intelligence about the Israeli nuclear program was not shared with the panel whose report therefore produced the plausible deniability that the administration sought.[29]

If a nuclear explosion did occur, it occurred within the 3000-mile-wide (4,800 km diameter) circle covering parts of the Indian Ocean, the South Atlantic, the southern tip of Africa, and a small part of Antarctica.[30]

Well before the Vela Incident, American intelligence agencies had made the assessment that Israel probably possessed its own nuclear weapons.[31] According to journalist Seymour Hersh, the detection was the third joint Israeli-South African nuclear test in the Indian Ocean, and the Israelis had sent two IDF ships and "a contingent of Israeli military men and nuclear experts" for the test.[1] Author Richard Rhodes also concludes the incident was an Israeli nuclear test, conducted in cooperation with South Africa, and that the United States administration deliberately obscured this fact in order to avoid complicating relations with South Africa.[2] Likewise, Leonard Weiss offers a number of arguments to support the test being Israeli, and claims that successive US administrations continue to cover up the test to divert unwanted attention that may portray its foreign policy in a bad light.[3] In the 2008 book The Nuclear Express: A Political History of the Bomb and its ProliferationThomas C. Reed and Danny B. Stillman stated their opinion that the "double flash" was the result of a joint South African-Israeli nuclear bomb test.[32]David Albright stated in his article about the "double flash" event in the Bulletin of Atomic Scientists that "If the 1979 flash was caused by a test, most experts agree it was probably an Israeli test".[33]

In 2010, it was reported that, on February 27, 1980, President Jimmy Carter wrote in his diary, "We have a growing belief among our scientists that the Israelis did indeed conduct a nuclear test explosion in the ocean near the southern end of Africa."[34]

Thomas C. Reed writes that he believes the Vela incident was an Israeli neutron bomb test.[36] The test would have gone undetected as the Israelis specifically chose a window of opportunity when, according to the published data, no active Vela satellites were observing the area. Additionally, the Israelis chose to set off the test during a typhoon. However, the Israelis and their South African partners had miscalculated as the over a decade-old Vela satellite which detected the blast had been officially listed by the US government as 'retired', although nonetheless was still able to receive data.[37] By 1984, according to Mordechai Vanunu, Israel was mass-producing neutron bombs.[38]

The Republic of South Africa did have a nuclear weapons program at the time, and it falls within that geographic location. Nevertheless, it had acceded to the Partial Test Ban Treaty in 1963,[39] and since the fall of apartheid, South Africa has disclosed most of the information on its nuclear weapons program, and according to international inspections and the ensuing International Atomic Energy Agency report, South Africa could not have constructed such a nuclear bomb until November 1979, two months after the "double flash" incident. Furthermore, the IAEA reported that all possible South African nuclear bombs had been accounted for. A Central Intelligence Agency (CIA) report dated January 21, 1980, that was produced for the United States Arms Control and Disarmament Agency concluded that:[40]

In sum, State/INR finds the arguments that South Africa conducted a nuclear test on 22 September inconclusive, even though, if a nuclear explosion occurred on that date, South Africa is the most likely candidate for responsibility.

Sasha Polakow-Suransky, writes that in 1979, South Africa was not yet advanced enough to test a nuclear device: "By the first week of October, the State Department had realized that South Africa was probably not the guilty party; Israel was a more likely candidate."[42]

In 1979, the DIA reported that the test might have been a Soviet test done in violation of the 1963 Partial Nuclear Test Ban Treaty.[43] The USSR had twenty years earlier in 1959 conducted a few secret underwater tests in the Pacific in violation of the 1958 bilateral moratorium between the Soviet Union and the USA (cf. List of nuclear weapons tests of the Soviet Union)[44][45][46] before the 1958 moratorium was unilaterally and officially abrogated by the Soviet Union in 1961.

India had carried out a nuclear test in 1974 (codenamed Smiling Buddha). The possibility that India would test a weapon was considered, since it would be possible for the Indian Navy to operate in those waters so far south, however, this was dismissed as impractical and unnecessary (given the fact that India had signed and ratified the Limited Test Ban Treaty or LTBT in 1963, and had complied with it even in its first test).[47]

An interagency intelligence memorandum requested by the United States National Security Council and entitled "The 22 September 1979 Event" analyzed the possibility of Pakistan wanting to prove its nuclear explosive technology in secret.[48]

Since the "double flash", if one existed, could have occurred not very far to the west of the French-owned Kerguelen Islands, it is possible that the French were testing a small neutron bomb[30] or other small tactical nuclear bomb.

TIROS-N plasma data and related geophysical data measured on 22 September 1979 were analyzed to determine whether the electron precipitation event detected by TIROS-N at 00:54:49 universal time could have been related to a surface nuclear burst (SNB). The occurrence of such a burst was inferred from light signals detected by two Vela bhangmeters −2 min before the TIROS-N event. We found the precipitation to be unusually large but not unique. It probably resulted from passage of TIROS-N through the precipitating electrons above a pre-existing auroral arc that may have brightened to an unusually high intensity from natural causes −3 min before the Vela signals....We conclude that such an event, although rare, is not unique and, furthermore, that this particular event was associated with an auroral arc that probably existed before the Vela event. Although it may be argued that the segment of the arc sampled by the TIROS-N was intensified by a SNB, we find no evidence to support this thesis or to suggest that the observation was anything but the result of natural magnetospheric processes.

There is still considerable disagreement within the Intelligence Community as to whether the flash in the South Atlantic detected by a US [...] satellite in September 1979 was a nuclear test, and if so, by South Africa. If the latter, the need for South Africa to test a device during the time frame of this Estimate is significantly diminished.[50][page needed]

Although I was not directly involved in planning or carrying out the operation, I learned unofficially that the flash was produced by an Israeli-South African test, code-named Operation Phoenix. The explosion was clean and was not supposed to be detected. But they were not as smart as they thought, and the weather changed — so the Americans were able to pick it up.[52]

Gerhardt further stated that no South African naval vessels had been involved, and that he had no first-hand knowledge of a nuclear test. Several years after the end of white rule the South African government admitted the apartheid government had indeed possessed six assembled nuclear weapons but the apartheid government had dismantled them before the changeover to the African National Congress government, there was no mention specifically of the Vela incident or of Israeli cooperation in South Africa's nuclear program.

On April 20, 1997, the Israeli daily newspaper Haaretz quoted the South African deputy foreign minister, Aziz Pahad, as supposedly confirming that the "double flash" from over the Indian Ocean was indeed from a South African nuclear test. Haaretz also cited past reports that Israel had purchased 550 tons of uranium from South Africa for its own nuclear plant in Dimona. In exchange, Israel allegedly supplied South Africa with nuclear weapons design information and nuclear materials to increase the power of nuclear warheads.[53] Pahad's statement was confirmed by the United States embassy in Pretoria, South Africa,[28][54] but Pahad's press secretary stated that Pahad had said only that "there was a strong rumor that a test had taken place, and that it should be investigated". In other words, he was merely repeating rumors that had been circulating for years.[55]David Albright, commenting on the stir created by this press report, stated:[55]

The U.S. government should declassify additional information about the event. A thorough public airing of the existing information could resolve the controversy.

There remains uncertainty about whether the South Atlantic flash in September 1979 recorded by optical sensors on the U.S. Vela satellite was a nuclear detonation and, if so, to whom it belonged.[56][page needed]

In 2003, Stansfield Turner, the Director of the C.I.A. during the Carter administration, stated that the Vela detection was of a "man-made phenomenon".[57]

In his 2006 book On the Brink, the retired C.I.A. clandestine service officer Tyler Drumheller wrote of his 1983–88 tour-of-duty in South Africa:

We had operational successes, most importantly regarding Pretoria's nuclear capability. My sources collectively provided incontrovertible evidence that the apartheid government had in fact tested a nuclear bomb in the South Atlantic in 1979, and that they had developed a delivery system with assistance from the Israelis.

In 2010, Jimmy Carter published his White House Diaries. In the entry for February 27, 1980, Jimmy Carter wrote:

"We have a growing belief among our scientists that the Israelis did indeed conduct a nuclear test explosion in the ocean near the southern end of Africa."[34]

Some American information related to this incident has been declassified in the form of heavily redacted reports and memoranda following applications made under the USA Freedom of Information Act; on May 5, 2006, many of these declassified documents were made available through the USA National Security Archive.[6]

Information contained in a 1987 CIA damage assessment[58] was partially declassified in December 2012

^N.B. quote (emphasis added): "They also picked up large lightning flashes, and it was in part from the Vela satellites that we learned about lightning superbolts. About five of every ten million bolts of lightning is classified as a superbolt, which is just what it sounds like: An unusually large bolt of lightning, lasting an unusually long time: About a thousandth of a second. Superbolts are almost always in the upper atmosphere, and usually over the oceans."